1620956143 has 2 divisors, whose sum is σ = 1620956144. Its totient is φ = 1620956142.

The previous prime is 1620956123. The next prime is 1620956149. The reversal of 1620956143 is 3416590261.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620956143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620956149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810478071 + 810478072.

It is an arithmetic number, because the mean of its divisors is an integer number (810478072).

Almost surely, 2^1620956143 is an apocalyptic number.

1620956143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620956143 is an equidigital number, since it uses as much as digits as its factorization.

1620956143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1620956143 is about 40261.0996248240. The cubic root of 1620956143 is about 1174.6913069871.

The spelling of 1620956143 in words is "one billion, six hundred twenty million, nine hundred fifty-six thousand, one hundred forty-three".